Wrapping mkvmuxer and mkvparser in the libwebm namespace is no
longer necessary now that the tree reorganization is complete.
Put mkvmuxer and mkvparser namespaces back in the global
namespace to avoid unnecessary churn in downstream code.
Change-Id: I13a4fe0143d20bb2bb6038078c68636ff2af0c29
(that is not already)
Some details:
- mkvmuxer and mkvparser wrapped by libwebm
- Matroska element constants moved from mkvmuxer to libwebm
- integer types moved from mkvmuxer to libwebm
Change-Id: Ic91e887e50adbc2d735bf6264534a5d01135df31
